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Applicators for liquid hot melt adhesive and methods of applying liquid hot melt adhesive

a liquid hot melt adhesive and application method technology, applied in the field of applications, can solve the problems of not being able to be simply stored for use, short operating life of activated liquid hot melt adhesives, etc., and achieve the effect of first viscosity that is relatively low

Inactive Publication Date: 2005-10-20
RINEY JOHN M +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0007] In accordance with one embodiment of the invention, a dispensing system includes a delivery system configured to supply a stream of the liquid hot melt adhesive in a non-activated first state. In the non-activated first state, the liquid hot melt adhesive has a first viscosity that is relatively low. The dispensing system further includes an applicator receiving the stream of the liquid hot melt adhesive from the delivery system. The applicator is adapted to modify the activation-sensitive property of the liquid ho...

Problems solved by technology

Activated liquid hot melt adhesives have a relatively short operating life and, hence, cannot be simply stored for use but must be dispensed shortly after activation.

Method used

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  • Applicators for liquid hot melt adhesive and methods of applying liquid hot melt adhesive
  • Applicators for liquid hot melt adhesive and methods of applying liquid hot melt adhesive
  • Applicators for liquid hot melt adhesive and methods of applying liquid hot melt adhesive

Examples

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Embodiment Construction

[0019] With reference to FIG. 1, an applicator 10 for intermittently dispensing viscous liquid hot melt adhesives includes a mixer / heat exchanger 12, a pumping module 14 and, optionally, at least one module or gun 16. The applicator 10 is mounted in a dispensing machine or system (not shown) in a known manner for dispensing liquid hot melt adhesive in discrete volumes, such as beads or dots, to provide an interrupted, non-continuous pattern on a moving substrate or as continuous beads or stripes. Multiple applicators 10 may be ganged together within the dispensing machine or system.

[0020] As used herein, liquid hot melt adhesive refers to any viscous liquid pumped from a bulk container in a first state and activated after pumping at, near, or proximate to an applicator by manipulating or modifying at least one activation-sensitive property of the liquid hot melt adhesive. The activation establishes a second state appropriate for adhesive bonding. For example, the changed property m...

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Abstract

Applicators and dispensing systems for dispensing liquid hot melt adhesives and methods of dispensing liquid hot melt adhesives. The dispensing system supplies the liquid hot melt adhesive in a non-activated state to the applicator. The liquid hot melt adhesive is processed to modify at least one activation-sensitive property before dispensing onto a substrate. The property may exhibit a temperature dependence, in which case the applicator or other structure near the applicator heats the liquid hot melt adhesive immediately before application. The property may exhibit a pressure dependence, in which case the applicator or other structure near the application applies pressure and / or shear forces to the liquid hot melt adhesive shortly before dispensing. Alternatively, a property that is both temperature and pressure dependent may be modified.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application No. 60 / 562,043, filed Apr. 14, 2004, which is hereby incorporated by reference herein in its entirety.FIELD OF THE INVENTION [0002] This invention relates generally to applicators and, more particularly, to applicators for dispensing liquid hot melt adhesive. BACKGROUND OF THE INVENTION [0003] Applicators are routinely used to dispense viscous liquids, such as hot melt adhesives, sealants and other thermoplastics, in the manufacture of products and in product packaging. Conventional applicators incorporate dispensing guns or modules that regulate the discharge of the viscous liquid by operation of a valve assembly. Generally, such valve assemblies feature a valve seat positioned in a fluid path and a valve element that is movable for selectively contacting the valve seat to define opened and closed conditions and controlling the flow of liquid through the fluid path to ...

Claims

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Application Information

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IPC IPC(8): A61F13/15B05C5/00B05C11/10B67D7/80
CPCB05C5/001Y10T156/1798B05C11/1042
Inventor RINEY, JOHN M.FISHER, DUANE J.SLATTERY, RAYMOND J. III
Owner RINEY JOHN M
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